Originally Posted by SavageNFS
I don't know for sure as I have already stated I keep mine attached, but with the ability to shift power levels on the fly, I don't see how the MiniMaxx isn't needed. I am certain my truck runs differently on stock vs. performance and I can change that at will with the MM attached. I'm pretty certain it tells the truck to just run at stock with emissions by passed when the Minimaxx is removed. This is confirmed by page 57 of my MM manual. This applies to 2011-2012 owners only.
Didn't see that before, good to know. As I said, I have always had it plugged in while running. I only take it out when the truck might sit for a day or two in single to below digit weather.
2011 F250 CC 4x4 XLT SWR 6.7
sold:1999 F150 EXT CAB 4x4 XLT 4.6 V8
sold:1989 F250 4x4 Reg Cab Long bed 5.8 351EFI 250k plus miles